When CA is the problem, ACR can fix it. But in most digital images, what you're seeing is not CA, it's fringing. You can fix it with "replace color" and the clone tool. A bit more work than a quick-fix CA correction but worth the effort most of the time. Paul Paul On Apr 13, 2007, at 11:30 PM, Brendan MacRae wrote:
> > --- Digital Image Studio <[EMAIL PROTECTED]> wrote: > >> On 14/04/07, Brendan MacRae >> <[EMAIL PROTECTED]> wrote: > >> It's endemic with most lenses, digital sensors just >> tend to exacerbate >> the problem, different coatings would make little >> difference as the >> source is lens aberrations. Fortunately CA is also >> easy to manage when >> post processing RAW images. > > Except that in my experience so far, ACR doesn't > handle CA worth a crap. The built in "fix" in the lens > tab seems a joke to me...it simply doesn't work. I > have also tried many other fixes in Photoshop all with > little effect. It's frustrating but I guess I'll keep > looking. So much for taking pictures, all I seem to do > is spend my time correcting them. > > >> A FF sensor would likely make the CA more apparent >> as the angle of >> incidence would be more acute towards the edges and >> the lenses will >> exhibit more distortion towards the edges. > > In other words, you'd find worse CA at the corners > since a FF sensor is using the entire image circle > instead of the so called, "sweet spot" utilized by the > smaller sensors? Wonderful...<pouring a glass of > scotch> > > >> Don't hope too much, the DA lenses seem to be all >> over the place some, >> exhibit slightly better CA, some worse than their >> rough A/FA >> counterparts. >> > > Criminey! This is driving me nuts...<taking a nip> > > Thanks for your input, Rob. > > -Brendan > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > > -- > PDML Pentax-Discuss Mail List > [EMAIL PROTECTED] > http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List [EMAIL PROTECTED] http://pdml.net/mailman/listinfo/pdml_pdml.net
